HIGH BEAM CONTROL (HBC) SYSTEM
id151000002300
Outline
• The High Beam Control (HBC) system turns the headlights HI off when the forward sensing camera (FSC) installed to the windshield recognizes a vehicle ahead and when traveling through towns and cities while the vehicle is being driven with the headlights HI turned on. As a result, driver visibility is assured while preventing blinding of other vehicles from headlight glare.
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Caution
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• Under the following conditions, the ability of the forward sensing camera (FSC) to detect light-emitting objects decreases, which could result in the system not operating normally and the inability to detect vehicles ahead.
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― Brightness of moonlight in surrounding area
― Poor visibility due to rain and fog
― Scratches or dirt on the camera lens or windshield glass
• Do not rely solely on the High Beam Control (HBC) system, and perform the appropriate switching operation based on a visual determination of the conditions.
• If the forward sensing camera (FSC) aiming is not completed correctly, the FSC cannot record the camera shooting angle and the High Beam Control (HBC) system may not operate normally. When performing the following servicing, always perform the forward sensing camera (FSC) aiming. In addition, for the FSC aiming procedure, refer to the [FORWARD SENSING CAMERA (FSC) AIMING] in the Workshop Manual.
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― Forward sensing camera (FSC) replacement
― Forward sensing camera (FSC) clip replacement
― Windshield replacement
Functions
• If the forward sensing camera (FSC) recognizes light-emitting objects (vehicles ahead, street lights (driving in town/city)) in front of the vehicle using the light-emitting object detection function while the vehicle is traveling with the headlights HI turned on, it turns off the headlights HI and turns the headlights HI on when light-emitting objects are no longer detected.
• For the light-emitting object detection function of the forward sensing camera (FSC), refer to the [FORWARD SENSING CAMERA (FSC)]. (See
FORWARD SENSING CAMERA (FSC).)
Setting function for control order of precedence
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• If several light-emitting objects are recognized (vehicles ahead, street lights (driving in town/city)), control is conducted according to the following order of precedence.
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1. Closest on-coming vehicle
2. Closest vehicle ahead
3. Street lights (driving in town/city)
System conditions display function
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• The forward sensing camera (FSC) displays the system status using the HBC indicator light (green) and HBC warning light (amber) in the instrument cluster, and the warning display on the center display.
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Condition
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HBC indicator light (green)
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HBC warning indicator light (amber)
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Multi-information display
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Center display
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Light switch is in AUTO and dimmer switch is in position other than HI
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Off
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Off
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No display
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No display
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Headlights off
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While vehicle is stopped
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System set to off by personalization
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Light switch is in AUTO and dimmer switch is in HI and headlights turned on
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On
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Off
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No display
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No display
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Forward sensing camera (FSC) detects camera fogging
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Off
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On
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Warning display*1
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Forward sensing camera (FSC) detects that the camera is dirty
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Malfunction in HBC occurs
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No display
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Forward sensing camera (FSC) has a malfunction
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No display
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Structural View
System Wiring Diagram
Block Diagram
Operation
Low beam switching operation
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• With the light switch in the AUTO position and the dimmer switch in the HI position and when the headlights are turned on, the headlights HI turns off to low beams when any of the following conditions are met:
Operation condition
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― Vehicles ahead, street lights (driving in town/city) are recognized
― Vehicle speed is 20 km/h {12 mph} or less (vehicle speed signal of 20 km/h {12 mph} or less is received)
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1. When any of the operation conditions is met, the forward sensing camera (FSC) sends (1) a headlight HI off request signal to the front body control module (FBCM) via CAN communication.
2. When the front body control module (FBCM) receives a headlight low beam switching request signal from the forward sensing camera (FSC), it turns the headlight HI relay off (2).
3. When the headlight HI relay turns on, the headlights HI turn off (3).
High beam return operation
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• When the following condition is met, the headlights HI turn on.
Operation condition
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― Vehicle speed is 30 km/h {19 mph} or more (vehicle signal of 30 km/h {19 mph} or more is received) and vehicles ahead or street lights (driving in town/city) are not recognized
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On-coming vehicles
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1. When the forward sensing camera (FSC) determines that a recognized on-coming vehicle moves away from the camera range, it sends (1) a headlight HI on request signal to the front body control module (FBCM) via CAN communication.
2. When the front body control module (FBCM) receives a headlight high beam switching request signal from the forward sensing camera (FSC), it turns the headlight HI relay on (2).
3. When the headlight HI relay turns on, the headlights HI turn on (3).
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Vehicles ahead or street lights (driving in town/city)
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1. If the forward sensing camera (FSC) no longer detects a recognized vehicle ahead which has moved away from the camera range, or there are street lights (driving in town/city) in the camera range, it maintains (1) the headlights LO on condition for a certain period of time.
2. If the forward sensing camera (FSC) does not detect vehicles ahead or street lights (driving in town/city) after the certain period of time has elapsed, it sends (2) a headlight HI on request signal to the front body control module (FBCM) via CAN communication.
3. When the front body control module (FBCM) receives a headlight high beam switching request signal from the forward sensing camera (FSC), it turns the headlight HI relay on (3).
4. When the headlight HI relay turns on, the headlights HI turn on (4).
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FSC loses sight of vehicle ahead which is cornering
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• If the forward sensing camera (FSC) loses sight of a recognized vehicle which is cornering, the FSC maintains the headlights LO on condition until reaching the locus at which the FSC lost sight of it.
• If the vehicle ahead is not detected at the locus at which the FSC had lost sight of it, the headlights HI are turned on. If the vehicle ahead is detected, the headlights LO on condition is maintained.
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FSC suddenly loses sight of light-emitting object within camera range (vehicles ahead, town/city streets (street lights))
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• If the forward sensing camera (FSC) suddenly loses sight of a recognized light-emitting object in the camera range, the headlights LO on condition is maintained for a certain period of time.
• Depending on whether a light-emitting object is detected or not after the certain period of time has elapsed, the system determines that the headlights HI are to be turned on.
Fail-safe
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• If a malfunction is detected in the system, control is inhibited and the headlights HI are turned on.
